Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3a6a3a3e34ffe4…

MALICIOUS

PDF

89.4 KB Created: 2021-07-29 19:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 0d87f06e29c2d7ffd7cd27cfbd73c310 SHA-1: 051c6c4d2e0c1f4dd77f8cab86dc68c165c72c0d SHA-256: 8f3a6a3a3e34ffe4581b2e1eca12b6a8be5b413e5d54b995bba859f6b6415195
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute further malicious content. The presence of a visual download button lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://vigova.vn/Images_upload/files/dewifojoxeludiluvuz.pdf In PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/368f4c5d9c36dff719a2ee11007906a1/zonekinutibupepuli.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608cebaa0372e---62696114040.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/d057bfed0d69f4f92df17d318ded2c68/49247501072.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/4417127174904cb66c5a1da7aa4711be/70889982571.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/0f181f4d60b3c336e05db647ae2a4e70/86737022537.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/xafumaxixibodefowemol.pdfIn PDF document text
    • https://media-get.com/userfiles/files/xilamofetojuropinanaxadi.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac91cdea1a2---76633470185.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/08f5d11549e7d4e55b910e8517c52948/wusudodagezopat.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/1mqt8074bhuund8psd5f5tagv9/1476282435.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a1977920c---64252380838.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/fikuzi.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160830eaae5ad1---desesufarub.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160945e711c951---47357085750.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/57494dac6c01b2acf7390c4abb478423/viwegolu.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e13319d0eff---zixerigakenonigaviraz.pdfIn PDF document text
    • http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/89081765709.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/bobodivekodovikaxali.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf57db100---84133319835.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/wonojukedeze.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/50i0fp66led485rq1idngf9roi/gemitavawomivigofovu.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/45049498751.pdfIn PDF document text
    • http://edgecs.net/documents/xujadagerofipobe.pdfIn PDF document text
    • http://viewcs.com/partner/upload/dextfile/busizawosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=essentials+of+human+anatomy+and+physiology+lab+manual+6th+edition+answer+keyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CD 17760 bytes
SHA-256: 1f6fd991e4a58f5d293d606f375e023398c8288b745733b5b802c44e3d2990c6
font_01_sfnt_off0001235d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235D 11628 bytes
SHA-256: 621e9d4d977edd87b759e72436d4f704d622d373c9b01c6c66d0e39101b95bc6
font_02_sfnt_off00013e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1